Effect of loading rate on shear strength parameters of mechanically and biologically treated waste

Highlights

● Mechanical behavior of MBT waste affected by loading rate was investigated.

● Shear strength ratio of MBT waste increases with an increase in loading rate.

● Cohesion is inversely related to loading rate.

● Internal friction angles are positively related to loading rate.

● MBT waste from China shows smaller range of φ.

Abstract

Mechanical biological treatment (MBT) technology has attracted increasing attention because it can reduce the volume of waste produced. To deal with the current trend of increasing waste, MBT practices are being adopted to address waste generated in developing urban societies. In this study, a total of 20 specimens of consolidated undrained triaxial tests were conducted on waste obtained from the Hangzhou Tianziling landfill, China, to evaluate the effect of loading rate on the shear strength parameters of MBT waste. The MBT waste samples exhibited an evident strain-hardening behavior, and no peak was observed even when the axial strain exceeded 25%. Further, the shear strength increased with an increase in the loading rate; the effect of loading rate on shear strength under a low confining pressure was greater than that under a high confining pressure. Furthermore, the shear strength parameters of MBT waste were related to the loading rate. The relationship between the cohesion, internal friction angle, and logarithm of the loading rate could be fitted to a linear relationship, which was established in this study. Finally, the ranges of shear strength parameters cohesion c and effective cohesion c ´ were determined as 1.0–8.2 kPa and 2.1–14.9 kPa, respectively; the ranges of the internal friction angle φ and effective internal friction angle φ ´ were determined as 16.2°–29° and 19.8°–43.9°, respectively. These results could be used as a valuable reference for conducting stability analyses of MBT landfills.

Graphical abstract

Keywords

Mechanically and biologically treated waste / Landfill / Triaxial test / Loading rate / Axial strain / Shear strength parameter

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Acknowledgements

This research was funded by the National Natural Science Foundation of China (Nos. 51978625 and 51678532) and the Zhejiang Provincial Natural Science Foundation of China (No. LZ21E080003). The authors are grateful for the assistance provided by the Hangzhou Environmental Group, China.

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11783-022-1595-7 and is accessible for authorized users.

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